<template>
  <div class="swiper-container skuImg-container">
    <div class="swiper-wrapper">
      <div class="swiper-slide" v-for='(skuImage,index) in skuInfo.skuImageList' :key='skuImage.id'>
        <img :src="skuImage.imgUrl" :class='{active:current===index}' @click="handlerImgUrl(index,skuImage.imgUrl)">
      </div>
    </div>
    <div class="swiper-button-next"></div>
    <div class="swiper-button-prev"></div>
  </div>
</template>

<script>

  import Swiper from 'swiper'
  import {mapGetters} from 'vuex'
  export default {
    name: "ImageList",
    data(){
      return {
        current:0
      }
    },
    computed:{
      ...mapGetters("detail", ["skuInfo"])
    },
    methods:{
      //点击小图换大图
      handlerImgUrl(index,img){
        //把索引赋值给变量用来实现高亮
        this.current = index
        //两重方式来实现小图换大图：
        //1、传图过去
        // this.$bus.$emit('get-image',img)
        //2、传索引去
        this.$bus.$emit('get-image',index)
      }
    },

    //因为要用轮播图，有数据的时候才new Swiper，但是轮播数据是从vuex中映射过来的，所以要监视一下数据
    watch: {
      //监听数据变化
    skuInfo() {
      this.$nextTick(() => {
        new Swiper(".skuImg-container", {
          // direction: "vertical", // 垂直切换选项
          // loop: true, // 循环模式选项
          // autoplay: true,
          slidesPerView: "auto", // 显示几张图片
          spaceBetween: 100, // 两张图片之间的间距

          // 如果需要前进后退按钮
          navigation: {
            nextEl: ".swiper-button-next",
            prevEl: ".swiper-button-prev",
          },
        });
      });
    },
  },
  }
</script>

<style lang="less" scoped>
  .swiper-container {
    height: 56px;
    width: 412px;
    box-sizing: border-box;
    padding: 0 12px;

    .swiper-slide {
      width: 56px;
      height: 56px;

      img {
        width: 100%;
        height: 100%;
        border: 1px solid #ccc;
        padding: 2px;
        width: 50px;
        height: 50px;
        display: block;

        &.active {
          border: 2px solid #f60;
          padding: 1px;
        }

        &:hover {
          border: 2px solid #f60;
          padding: 1px;
        }
      }
    }

    .swiper-button-next {
      left: auto;
      right: 0;
    }

    .swiper-button-prev {
      left: 0;
      right: auto;
    }

    .swiper-button-next,
    .swiper-button-prev {
      box-sizing: border-box;
      width: 12px;
      height: 56px;
      background: rgb(235, 235, 235);
      border: 1px solid rgb(204, 204, 204);
      top: 0;
      margin-top: 0;
      &::after {
        font-size: 12px;
      }
    }
  }
</style>